Oracle DR: Convert restore scripts to PowerShell for SSH compatibility

- Add cleanup_database.ps1: PowerShell version without input redirection issues
- Add rman_restore_from_zero.ps1: PowerShell version with inline SQL commands
- Update weekly-dr-test-proxmox.sh: Call .ps1 scripts via PowerShell

PowerShell scripts resolve SSH 'Input redirection not supported' errors
All SQL commands are piped directly to sqlplus (no temp files needed)

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

oracle/standby-server-scripts/weekly-dr-test-proxmox.sh

@@ -362,7 +362,7 @@ run_dr_test() {
             log "STEP 4: Running database restore"
 
             if ssh -p "$DR_VM_PORT" "$DR_VM_USER@$DR_VM_IP" \
-                "D:\\oracle\\scripts\\rman_restore_from_zero.cmd" 2>&1 | tee -a "$LOG_FILE"; then
+                "powershell -ExecutionPolicy Bypass -File D:\\oracle\\scripts\\rman_restore_from_zero.ps1" 2>&1 | tee -a "$LOG_FILE"; then
 
                 local restore_end=$(date +%s)
                 restore_duration=$(( (restore_end - restore_start) / 60 ))